8th Class Science Force and Pressure Question Bank

done Force and Pressure Conceptive Objective Problems Total Questions - 30

• question_answer1)
  In order to push or pull an object
  A)
   force must be applied     done clear
  B)
   speed must be applied done clear
  C)
   friction must be applied done clear
  D)
   electricity must be applied done clear
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• question_answer2)
  Roger noticed a book lying on a table. In order to move the book, he must apply a
  A)
   gear                      done clear
  B)
   load    done clear
  C)
   force    done clear
  D)
   speed      done clear
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• question_answer3)
     A bus is moving along a curved path, as shown in the given figure. During the motion of the bus, the direction of force on it:
  A)
   remains the same done clear
  B)
   changes continuously done clear
  C)
   is directed in the backward direction done clear
  D)
   is directed in the downward direction done clear
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• question_answer4)
  A car moves with a constant speed toward East. A force is applied on the car to make it stop. The direction of the applied force is toward
  A)
   North                                   done clear
  B)
   South done clear
  C)
   West     done clear
  D)
   East done clear
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• question_answer5)
  Four boys, Hunter, Jackson, Samuel, and Sean are pushing a heavy box. Their respective forces are listed below.

  Boy	Force (N)
  Hunter	25
  Jackson	25
  Samuel	30
  Sean	35

  As a result of the presence of sand on the ground, the frictional force between the box and the ground is 15 N. The total force experienced by the box is
  A)
   100 N toward the left done clear
  B)
   115N toward the left done clear
  C)
   100 N toward the right done clear
  D)
   115 N toward the right done clear
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• question_answer6)
  Eric and Evan are pulling a big load in opposite directions. Eric is applying a force of 20.56 N, while Evan is applying a force of 25.7 N on the load.
  A)
   4.15 N toward Evan done clear
  B)
   5.14 N toward Evan done clear
  C)
   4.15 N toward Eric done clear
  D)
   5.14 N toward Eric done clear
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• question_answer7)
  A ball rolls at constant speed in a straight line along the ground. Jerry kicks the ball in the direction of its motion-As a result of Jerrys kick, speed of the ball will
  A)
   increase           done clear
  B)
   decrease done clear
  C)
   remain same                     done clear
  D)
   become zero done clear
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• question_answer8)
  When a wooden box is suspended by a spring balance, the spring stretches because
  A)
   Earths gravity pulls the box done clear
  B)
   Earths magnetic field attracts the spring done clear
  C)
   of the frictional force between the box and the spring done clear
  D)
   of the electrostatic force between the box and the spring done clear
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• question_answer9)
  Joanna is playing carrom along with her friends. She strikes the striker with her index finger and pockets the queen. Joanna uses which force for pocketing the queen?
  A)
   Electric                 done clear
  B)
   Magnetic done clear
  C)
   Muscular            done clear
  D)
   Gravitational done clear
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• question_answer10)
  Two magnets are placed at a distance from each other on a frictionless surface, as shown in the given figure. The magnets will experience
  A)
   only magnetic force done clear
  B)
   only frictional force done clear
  C)
   magnetic and frictional forces done clear
  D)
   magnetic and gravitational forces done clear
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• question_answer11)
  A ball that is thrown up returns to the surface of Earth because of
  A)
   gravity           done clear
  B)
   friction done clear
  C)
   electricity           done clear
  D)
   magnetism done clear
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• question_answer12)
  The direction of force on an upward moving ball is from
  A)
   up to down                        done clear
  B)
   down to up done clear
  C)
   left to right                        done clear
  D)
   right to left done clear
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• question_answer13)
  The acceleration due to gravity is \[~9.8\text{ }m/{{s}^{2}}\]
  A)
   Much above the earths surface done clear
  B)
   Near the earths surface done clear
  C)
   Deep inside the earth done clear
  D)
   At the centre of the earth done clear
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• question_answer14)
  A particle is taken to a height R above the earths surface, where R is the radius of the earth. The acceleration due to gravity there is
  A)
   \[2.45\text{ }m/{{s}^{2}}\]          done clear
  B)
   \[4.9\text{ }m/{{s}^{2}}\] done clear
  C)
   \[9.8\text{ }m/{{s}^{2}}\]            done clear
  D)
   \[19.6\text{ }m/{{s}^{2}}\] done clear
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• question_answer15)
  When a body is thrown up, the force of gravity is
  A)
   in upward direction done clear
  B)
   in downward direction done clear
  C)
   zero done clear
  D)
   in horizontal direction done clear
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• question_answer16)
  Mass of an object is
  A)
   amount of matter present in the object done clear
  B)
   same as weight of an object done clear
  C)
   measure of gravitational pull done clear
  D)
   none of these done clear
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• question_answer17)
  The weight of an object is
  A)
   the quantity of matter it contains done clear
  B)
   refers to its inertia done clear
  C)
   same as its mass but is expressed in different units done clear
  D)
   the force with which it is attracted towards the earth done clear
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• question_answer18)
  Weight of an object depends on
  A)
   temperature of the place done clear
  B)
   atmosphere of the place done clear
  C)
   mass of an object done clear
  D)
   none of these done clear
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• question_answer19)
  The mass of body is measured to be 12 kg on the earth. Its mass on moon will be
  A)
   12 kg                     done clear
  B)
   6 kg done clear
  C)
   2 kg.                      done clear
  D)
   72 kg done clear
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• question_answer20)
  Vishnu has two plastic bottles of different shapes. The two bottles are connected through a pipe, as shown in the given figure. Initially, both the bottles have water up to an equal level. One of the bottles has a tap. Vishnu opens the tap for some time such that the water level in bottle II decreases by one centimetre. The initial water level in each bottle is seven centimetres. What is the new water level in bottle I?
  A)
   5.5 cm                  done clear
  B)
   6.0 cm done clear
  C)
   6.5 cm                  done clear
  D)
   7.0 cm done clear
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• question_answer21)
  A tin container is shown in the given figure. There are four circular openings of equal diameter in the side wall of the container. The openings are labelled as I, II, III, and IV. These openings allow the water present in the container to come out through them. The water coming out through opening   ___i___  will fall at the nearest distance from the container, while that coming out through opening   ___ii___  will fall at the farthest distance from the container.
  A)
    \[i-I,ii-IV\]         done clear
  B)
    \[i-II,\text{ }ii-III\] done clear
  C)
   \[i-III,ii-II\]         done clear
  D)
   \[i-III,ii-II\] done clear
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• question_answer22)
  Four actions: I  When pressed, the water present in a rubbe dropper rises. II A nail is pushed into a wall. III A postcard remains attached to an inverts glass of water. IV When pressed, a rubber sucker gets attached to a wall. Which of the following actions is not caused by atmospheric pressure?
  A)
   I                                              done clear
  B)
   II done clear
  C)
   III                                           done clear
  D)
   IV done clear
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• question_answer23)
  The value of atmospheric pressure on the surface of earth at sea level is nearly Take density of mercury\[=\text{ }13600\text{ }kg/{{m}^{3}}\]; density of water \[=\text{ }1000\text{ }kg/{{m}^{3}}\]
  A)
   \[{{10}^{5}}\text{ }Pa\] done clear
  B)
   \[{{10}^{3}}\text{ }Pa\] done clear
  C)
   \[{{10}^{1}}\text{ }Pa\]                done clear
  D)
   \[{{10}^{4}}\text{ }Pa\] done clear
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• question_answer24)
  The liquid used in Barometer is:
  A)
   Mercury          done clear
  B)
   Kerosene done clear
  C)
   Water                                  done clear
  D)
   Alcohol done clear
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• question_answer25)
  1 atm = __________ m Hg.
  A)
   0.76       done clear
  B)
   76          done clear
  C)
   760                                        done clear
  D)
   7.6 done clear
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• question_answer26)
  Standard atmospheric pressure is :
  A)
   \[76\text{ }\times \text{ }13.6\text{ }\times \text{ }980\text{ }cm\] of mercury column done clear
  B)
   \[76\text{ }dyne\text{ }c{{m}^{-2}}\] done clear
  C)
   \[76\text{ }\times \text{ }13.6\text{ }cm\] of water column done clear
  D)
   \[76\text{ }\times \text{ }980\text{ }dyne\text{ }c{{m}^{-2}}\] done clear
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• question_answer27)
   Atmospheric pressure is measured by :
  A)
   Thermometer done clear
  B)
   Calorimeter done clear
  C)
   Hydrometer                      done clear
  D)
   Barometer done clear
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• question_answer28)
  The column of mercury in a barometer is 76 cm Hg. Calculate the atmospheric pressure if the density of mercury \[=13600\text{ }kg{{m}^{-3}}\]. (Take\[g\text{ }=\text{ }10\text{ }m{{s}^{-(}}B\]).
  A)
   \[1.03\text{ }\times \text{ }{{10}^{5\text{ }}}Pa\]            done clear
  B)
   \[1.03\,\times \text{ 1}{{0}^{3}}\text{ }Pa\] done clear
  C)
   \[1.03\text{ }\times \text{ 1}{{0}^{4}}\text{ }Pa\]            done clear
  D)
   \[1.03\text{ }\times \text{ }{{10}^{6}}\text{ }Pa\] done clear
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• question_answer29)
  If the mercury in the barometer is replaced by water, what will be the resulting height of the water column? Density of water \[=1000\text{ }kg{{m}^{-3}}\]density of mercury \[=13600\text{ }kg{{m}^{-3}}\].
  A)
   0.76 m                  done clear
  B)
   10 m   done clear
  C)
   10.3 m                  done clear
  D)
   11 m done clear
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• question_answer30)
  If \[20c{{m}^{3}}\] gas at latm is expanded to \[50c{{m}^{3}}\] at constant T, then what is the fmal pressure?
  A)
   \[20\times \frac{1}{50}atm\]     done clear
  B)
   \[50\times \frac{1}{20}atm\] done clear
  C)
   \[\frac{1}{20\times 50}atm\]                     done clear
  D)
   None of these           done clear
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